660566061 has 6 divisors (see below), whose sum is σ = 954150990. Its totient is φ = 440377368.

The previous prime is 660566057. The next prime is 660566063. The reversal of 660566061 is 160665066.

It can be written as a sum of positive squares in only one way, i.e., 544055625 + 116510436 = 23325^2 + 10794^2 .

It is not a de Polignac number, because 660566061 - 2² = 660566057 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660566063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36698106 + ... + 36698123.

It is an arithmetic number, because the mean of its divisors is an integer number (159025165).

Almost surely, 2^660566061 is an apocalyptic number.

It is an amenable number.

660566061 is a deficient number, since it is larger than the sum of its proper divisors (293584929).

660566061 is a wasteful number, since it uses less digits than its factorization.

660566061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73396235 (or 73396232 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 660566061 is about 25701.4797433922. The cubic root of 660566061 is about 870.9076100977.

The spelling of 660566061 in words is "six hundred sixty million, five hundred sixty-six thousand, sixty-one".